path: root/src/mesa/pipe/cell/spu/main.c

/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/


/* main() for Cell SPU code */


#include <stdio.h>
#include <libmisc.h>
#include <spu_mfcio.h>

#include "main.h"
#include "tri.h"
#include "tile.h"
#include "pipe/cell/common.h"
#include "pipe/p_defines.h"

/*
helpful headers:
/usr/lib/gcc/spu/4.1.1/include/spu_mfcio.h
/opt/ibm/cell-sdk/prototype/sysroot/usr/include/libmisc.h
*/

static boolean Debug = FALSE;

volatile struct cell_init_info init;

struct framebuffer fb;



void
wait_on_mask(unsigned tagMask)
{
   mfc_write_tag_mask( tagMask );
   /* wait for completion of _any_ DMAs specified by tagMask */
   mfc_read_tag_status_any();
}


static void
wait_on_mask_all(unsigned tagMask)
{
   mfc_write_tag_mask( tagMask );
   /* wait for completion of _any_ DMAs specified by tagMask */
   mfc_read_tag_status_all();
}



/**
 * For tiles whose status is TILE_STATUS_CLEAR, write solid-filled
 * tiles back to the main framebuffer.
 */
static void
really_clear_tiles(uint surfaceIndex)
{
   const uint num_tiles = fb.width_tiles * fb.height_tiles;
   uint i, j;

   if (surfaceIndex == 0) {
      for (i = 0; i < TILE_SIZE; i++)
         for (j = 0; j < TILE_SIZE; j++)
            ctile[i][j] = fb.color_clear_value;

      for (i = init.id; i < num_tiles; i += init.num_spus) {
         uint tx = i % fb.width_tiles;
         uint ty = i / fb.width_tiles;
         if (tile_status[ty][tx] == TILE_STATUS_CLEAR) {
            put_tile(&fb, tx, ty, (uint *) ctile, TAG_SURFACE_CLEAR, 0);
         }
      }
   }
   else {
      for (i = 0; i < TILE_SIZE; i++)
         for (j = 0; j < TILE_SIZE; j++)
            ztile[i][j] = fb.depth_clear_value;

      for (i = init.id; i < num_tiles; i += init.num_spus) {
         uint tx = i % fb.width_tiles;
         uint ty = i / fb.width_tiles;
         if (tile_status_z[ty][tx] == TILE_STATUS_CLEAR)
            put_tile(&fb, tx, ty, (uint *) ctile, TAG_SURFACE_CLEAR, 1);
      }
   }

#if 0
   wait_on_mask(1 << TAG_SURFACE_CLEAR);
#endif
}


static void
clear_surface(const struct cell_command_clear_surface *clear)
{
   const uint num_tiles = fb.width_tiles * fb.height_tiles;
   uint i, j;

#define CLEAR_OPT 1
#if CLEAR_OPT
   /* set all tile's status to CLEAR */
   if (clear->surface == 0) {
      memset(tile_status, TILE_STATUS_CLEAR, sizeof(tile_status));
      fb.color_clear_value = clear->value;
   }
   else {
      memset(tile_status_z, TILE_STATUS_CLEAR, sizeof(tile_status_z));
      fb.depth_clear_value = clear->value;
   }
   return;
#endif

   if (clear->surface == 0) {
      for (i = 0; i < TILE_SIZE; i++)
         for (j = 0; j < TILE_SIZE; j++)
            ctile[i][j] = clear->value;
   }
   else {
      for (i = 0; i < TILE_SIZE; i++)
         for (j = 0; j < TILE_SIZE; j++)
            ztile[i][j] = clear->value;
   }

   /*
   printf("SPU: %s num=%d w=%d h=%d\n",
          __FUNCTION__, num_tiles, fb.width_tiles, fb.height_tiles);
   */

   for (i = init.id; i < num_tiles; i += init.num_spus) {
      uint tx = i % fb.width_tiles;
      uint ty = i / fb.width_tiles;
      if (clear->surface == 0)
         put_tile(&fb, tx, ty, (uint *) ctile, TAG_SURFACE_CLEAR, 0);
      else
         put_tile(&fb, tx, ty, (uint *) ztile, TAG_SURFACE_CLEAR, 1);
      /* XXX we don't want this here, but it fixes bad tile results */
   }

#if 0
   wait_on_mask(1 << TAG_SURFACE_CLEAR);
#endif
}


/**
 * Given a rendering command's bounding box (in pixels) compute the
 * location of the corresponding screen tile bounding box.
 */
static INLINE void
tile_bounding_box(const struct cell_command_render *render,
                  uint *txmin, uint *tymin,
                  uint *box_num_tiles, uint *box_width_tiles)
{
#if 1
   /* Debug: full-window bounding box */
   uint txmax = fb.width_tiles - 1;
   uint tymax = fb.height_tiles - 1;
   *txmin = 0;
   *tymin = 0;
   *box_num_tiles = fb.width_tiles * fb.height_tiles;
   *box_width_tiles = fb.width_tiles;
   (void) render;
   (void) txmax;
   (void) tymax;
#else
   uint txmax, tymax, box_height_tiles;

   *txmin = (uint) render->xmin / TILE_SIZE;
   *tymin = (uint) render->ymin / TILE_SIZE;
   txmax = (uint) render->xmax / TILE_SIZE;
   tymax = (uint) render->ymax / TILE_SIZE;
   *box_width_tiles = txmax - *txmin + 1;
   box_height_tiles = tymax - *tymin + 1;
   *box_num_tiles = *box_width_tiles * box_height_tiles;
#endif
#if 0
   printf("Render bounds: %g, %g  ...  %g, %g\n",
          render->xmin, render->ymin, render->xmax, render->ymax);
   printf("Render tiles:  %u, %u .. %u, %u\n", *txmin, *tymin, txmax, tymax);
#endif
}


static void
render(const struct cell_command_render *render)
{
   /* we'll DMA into these buffers */
   ubyte vertex_data[CELL_MAX_VBUF_SIZE] ALIGN16_ATTRIB;
   ushort indexes[CELL_MAX_VBUF_INDEXES] ALIGN16_ATTRIB;

   uint i, j, vertex_size, vertex_bytes, index_bytes;

   ASSERT_ALIGN16(render->vertex_data);
   ASSERT_ALIGN16(render->index_data);

   vertex_size = render->num_attribs * 4 * sizeof(float);

   /* how much vertex data */
   vertex_bytes = render->num_verts * vertex_size;
   index_bytes = render->num_indexes * sizeof(ushort);
   if (index_bytes < 8)
      index_bytes = 8;
   else
      index_bytes = (index_bytes + 15) & ~0xf; /* multiple of 16 */

   /*
   printf("VBUF: indices at %p,  vertices at %p  vertex_bytes %u  ind_bytes %u\n",
          render->index_data, render->vertex_data, vertex_bytes, index_bytes);
   */

   /* get vertex data from main memory */
   mfc_get(vertex_data,  /* dest */
           (unsigned int) render->vertex_data,  /* src */
           vertex_bytes,  /* size */
           TAG_VERTEX_BUFFER,
           0, /* tid */
           0  /* rid */);

   /* get index data from main memory */
   mfc_get(indexes,  /* dest */
           (unsigned int) render->index_data,  /* src */
           index_bytes,
           TAG_INDEX_BUFFER,
           0, /* tid */
           0  /* rid */);

   wait_on_mask_all((1 << TAG_VERTEX_BUFFER) |
                    (1 << TAG_INDEX_BUFFER));

   /* find tiles which intersect the prim bounding box */
   uint txmin, tymin, box_width_tiles, box_num_tiles;
#if 0
   tile_bounding_box(render, &txmin, &tymin,
                     &box_num_tiles, &box_width_tiles);
#else
   txmin = 0;
   tymin = 0;
   box_num_tiles = fb.width_tiles * fb.height_tiles;
   box_width_tiles = fb.width_tiles;
#endif

   /* make sure any pending clears have completed */
   wait_on_mask(1 << TAG_SURFACE_CLEAR);

   /* loop over tiles */
   for (i = init.id; i < box_num_tiles; i += init.num_spus) {
      const uint tx = txmin + i % box_width_tiles;
      const uint ty = tymin + i / box_width_tiles;

      ASSERT(tx < fb.width_tiles);
      ASSERT(ty < fb.height_tiles);

      /* Start fetching color/z tiles.  We'll wait for completion when
       * we need read/write to them later in triangle rasterization.
       */
      if (fb.depth_format == PIPE_FORMAT_Z16_UNORM) {
         if (tile_status_z[ty][tx] != TILE_STATUS_CLEAR) {
            get_tile(&fb, tx, ty, (uint *) ztile, TAG_READ_TILE_Z, 1);
         }
      }

      if (tile_status[ty][tx] != TILE_STATUS_CLEAR) {
         get_tile(&fb, tx, ty, (uint *) ctile, TAG_READ_TILE_COLOR, 0);
      }

      ASSERT(render->prim_type == PIPE_PRIM_TRIANGLES);

      /* loop over tris */
      for (j = 0; j < render->num_indexes; j += 3) {
         const float *v0, *v1, *v2;

         v0 = (const float *) (vertex_data + indexes[j+0] * vertex_size);
         v1 = (const float *) (vertex_data + indexes[j+1] * vertex_size);
         v2 = (const float *) (vertex_data + indexes[j+2] * vertex_size);

         tri_draw(v0, v1, v2, tx, ty);
      }

      /* write color/z tiles back to main framebuffer, if dirtied */
      if (tile_status[ty][tx] == TILE_STATUS_DIRTY) {
         put_tile(&fb, tx, ty, (uint *) ctile, TAG_WRITE_TILE_COLOR, 0);
         tile_status[ty][tx] = TILE_STATUS_DEFINED;
      }
      if (fb.depth_format == PIPE_FORMAT_Z16_UNORM) {
         if (tile_status_z[ty][tx] == TILE_STATUS_DIRTY) {
            put_tile(&fb, tx, ty, (uint *) ztile, TAG_WRITE_TILE_Z, 1);
            tile_status_z[ty][tx] = TILE_STATUS_DEFINED;
         }
      }

      /* XXX move these... */
      wait_on_mask(1 << TAG_WRITE_TILE_COLOR);
      if (fb.depth_format == PIPE_FORMAT_Z16_UNORM) {
         wait_on_mask(1 << TAG_WRITE_TILE_Z);
      }
   }
}



/**
 * Temporary/simple main loop for SPEs: Get a command, execute it, repeat.
 */
static void
main_loop(void)
{
   struct cell_command cmd;
   int exitFlag = 0;

   if (Debug)
      printf("SPU %u: Enter main loop\n", init.id);

   ASSERT((sizeof(struct cell_command) & 0xf) == 0);
   ASSERT_ALIGN16(&cmd);

   while (!exitFlag) {
      unsigned opcode;
      int tag = 0;

      if (Debug)
         printf("SPU %u: Wait for cmd...\n", init.id);

      /* read/wait from mailbox */
      opcode = (unsigned int) spu_read_in_mbox();

      if (Debug)
         printf("SPU %u: got cmd %u\n", init.id, opcode);

      /* command payload */
      mfc_get(&cmd,  /* dest */
              (unsigned int) init.cmd, /* src */
              sizeof(struct cell_command), /* bytes */
              tag,
              0, /* tid */
              0  /* rid */);
      wait_on_mask( 1 << tag );

      switch (opcode) {
      case CELL_CMD_EXIT:
         if (Debug)
            printf("SPU %u: EXIT\n", init.id);
         exitFlag = 1;
         break;
      case CELL_CMD_FRAMEBUFFER:
         if (Debug)
            printf("SPU %u: FRAMEBUFFER: %d x %d at %p, cformat 0x%x  zformat 0x%x\n",
                   init.id,
                   cmd.fb.width,
                   cmd.fb.height,
                   cmd.fb.color_start,
                   cmd.fb.color_format,
                   cmd.fb.depth_format);
         fb.color_start = cmd.fb.color_start;
         fb.depth_start = cmd.fb.depth_start;
         fb.color_format = cmd.fb.color_format;
         fb.depth_format = cmd.fb.depth_format;
         fb.width = cmd.fb.width;
         fb.height = cmd.fb.height;
         fb.width_tiles = (fb.width + TILE_SIZE - 1) / TILE_SIZE;
         fb.height_tiles = (fb.height + TILE_SIZE - 1) / TILE_SIZE;
         /*
         printf("SPU %u: %u x %u tiles\n",
                init.id, fb.width_tiles, fb.height_tiles);
         */
         break;
      case CELL_CMD_CLEAR_SURFACE:
         if (Debug)
            printf("SPU %u: CLEAR SURF %u to 0x%08x\n", init.id,
                   cmd.clear.surface, cmd.clear.value);
         clear_surface(&cmd.clear);
         break;
      case CELL_CMD_RENDER:
         if (Debug)
            printf("SPU %u: RENDER prim %u, indices: %u, nr_vert: %u\n",
                   init.id,
                   cmd.render.prim_type,
                   cmd.render.num_verts,
                   cmd.render.num_indexes);
         render(&cmd.render);
         break;

      case CELL_CMD_FINISH:
         if (Debug)
            printf("SPU %u: FINISH\n", init.id);
         really_clear_tiles(0);
         /* wait for all outstanding DMAs to finish */
         mfc_write_tag_mask(~0);
         mfc_read_tag_status_all();
         /* send mbox message to PPU */
         spu_write_out_mbox(CELL_CMD_FINISH);
         break;
      default:
         printf("Bad opcode!\n");
      }

   }

   if (Debug)
      printf("SPU %u: Exit main loop\n", init.id);
}



static void
one_time_init(void)
{
   memset(tile_status, TILE_STATUS_DEFINED, sizeof(tile_status));
   memset(tile_status_z, TILE_STATUS_DEFINED, sizeof(tile_status_z));
}


/**
 * SPE entrypoint.
 * Note: example programs declare params as 'unsigned long long' but
 * that doesn't work.
 */
int
main(unsigned long speid, unsigned long argp)
{
   int tag = 0;

   (void) speid;

   one_time_init();

   if (Debug)
      printf("SPU: main() speid=%lu\n", speid);

   mfc_get(&init,  /* dest */
           (unsigned int) argp, /* src */
           sizeof(struct cell_init_info), /* bytes */
           tag,
           0, /* tid */
           0  /* rid */);
   wait_on_mask( 1 << tag );


   main_loop();

   return 0;
}